As parting shots go, it packed quite a punch. But then it had been coming for some time. In an open letter announcing his resignation from Portland State University in Oregon, assistant philosophy professor Peter Boghossian condemned his former employer as a “social justice factory, whose only inputs were race, gender and victimhood and whose only outputs were grievance and division”. What had once been a bastion of free inquiry was gripped by “a culture of offense where students are too afraid to speak openly and honestly”. His broadside echoed right across the United States. […] Today, most US universities...